2
Safety Rules ......................................... 2-3
Warranty ............................................... 4-5
Product Spec i fi
ca tions ........................... 5
Assembly/Pre-Operation ...................... 6-7
Operation ............................................ 8-12
Maintenance Schedule .......................... 13
Maintenance ..................................... 13-16
Service and Adjustments .................. 17-18
Storage ............................................. 18-19
Troubleshooting ................................ 20-21
Repair Parts ...................................... 22-31
Sears Service ..........................Back Cover
TABLE OF CONTENTS
SAFETY RULES
IMPORTANT:
This cutting machine is
capable of amputating hands and feet and
throwing objects. Failure to observe the
following safety instructions could result in
serious injury or death.
Look for this symbol to point out im-
por tant safety precautions. It means
CAU TION!!! BECOME ALERT!!!
YOUR SAFE TY IS INVOLVED.
WARNING:
In order to prevent ac-
ci den tal starting when setting up, trans-
port ing, ad just ing or making repairs,
always dis con nect spark plug wire and
place wire where it can not come in contact
with plug.
CAUTION:
Muffl er and other engine
parts become extremely hot during
operation and remain hot after engine
has stopped. To avoid severe burns on
contact, stay away from these areas.
I. GENERAL OPERATION
• Read, understand, and follow all in struc -
tions on the machine and in the manual(s)
before starting. Be thor ough ly familiar with
the controls and the proper use of the ma-
chine before starting.
• Do not put hands or feet near or under
rotating parts. Keep clear of the dis charge
opening at all times.
• Only allow responsible individuals, who
are familiar with the in struc tions, to oper-
ate the machine.
• Clear the area of objects such as rocks,
toys, wire, bones, sticks, etc., which could
be picked up and thrown by blade.
• Be sure the area is clear of other people
before mowing. Stop ma chine if anyone
enters the area.
• Do not operate the mower when bare foot
or wearing open sandals. Al ways wear
substantial foot wear.
• Do not pull mower backwards unless
absolutely nec es sary. Always look down
and behind before and while moving
backwards.
• Never direct discharged material toward
anyone. Avoid discharging material
against a wall or obstruction. Material
may richochet back toward the opera-
tor. Stop the blade when crossing gravel
surfaces.
• Do not operate the mower without proper
guards, plates, grass catcher or oth
er
safety protective devices in place.
• See manufacturer’s instructions for proper
operation and installation of accessories.
Only use accessories approved by the
manufacturer.
• Stop the blade(s) when crossing grav el
drives, walks, or roads.
• Stop the engine (motor) whenever you
leave the equip ment, before clean ing the
mower or unclogging the chute.
• Shut the engine (motor) off and wait until
the blade comes to complete stop before
removing grass catcher.
• Mow only in daylight or good artifi cial
light.
• Do not operate the machine while under
the infl uence of alcohol or drugs.
• Never operate machine in wet grass. Al-
ways be sure of your footing: keep a fi rm
hold on the handle; walk, never run.
• Disengage the self-propelled mech a nism
or drive clutch on mowers so equipped
before starting the engine.
• If the equipment should start to vi brate
abnormally, stop the engine (motor) and
check immediately for the cause. Vibration
is generally a warning of trouble.
• Always wear safety goggles or safe
ty
glasses with side shields when op er at ing
mower.
II. SLOPE OPERATION
Slopes are a major factor related to slip & fall
accidents which can result in severe injury.
All slopes require extra caution. If you feel
uneasy on a slope, do not mow it.
31
KEY PART
NO. NO.
DESCRIPTION
334 691061 Screw
(Magneto
Armature)
337 591040 Plug-Spark
356 692390 Wire-Stop
358 794307 Gasket
Set-Engine
362 793351 Shield-Spark
Plug
365 691688 Screw
(Carburetor)
404 690272
Washer (Governor Crank)
425 690670
Screw (Air Cleaner Cover)
443 692523 Screw
(Air Cleaner Primer Base)
445 491588s Filter-Air Cleaner Cartridge
455 791960 Cup-Flywheel
456 692299 Plate-Pawl
Friction
459 281505s Pawl-Ratchet
505 691251
Nut (Governor Control Lever)
523 499621 Dipstick
524 692296 Seal-
Dipstick
Tube
525 495265 Tube-Dipstick
562 691119
Bolt (Governor Control Lever)
584 697734 Cover-Breather
Passage
585 691879 Gasket-Breather
Passage
592 690800
Nut (Rewind Starter)
597 691696
Screw (Pawl Friction Plate)
601 791850 Clamp-Hose
(Green)
608 497680 Starter-Rewind
613 790833 Screw
(Muffl
er)
615 690340 Retainer-Governor
Shaft
616 698801 Crank-Governor
617 270344s Seal-O Ring (Intake Manifold)
621 692310 Switch-Stop
(Brake)
633 691321
Seal-Choke / Throttle Shaft
(Throttle
Shaft)
633A 693867
Seal-Choke / Throttle Shaft
(Choke
Shaft)
684 690345 Screw
(Breather Passage Cover)
689 691855 Spring-Friction
718 690959 Pin-Locating
725 590460 Shield-Heat
741 797521 Gear-Timing
745 691648 Screw
(Brake)
KEY PART
NO. NO.
DESCRIPTION
842 691031 Seal-O-Ring
(Dipstick
Tube)
847 692047 Dipstick/Tube
Assembly
851 493880s Terminal-Spark
Plug
853 695268 Adapter-Wire
868 697338 Seal-Valve
869 691155 Seat-Valve
(Intake)
870 690380 Seat-Valve
(Exhaust)
871 590409 Bushing-Valve
Guide
883 691881 Gasket-Exhaust
922 692135 Spring-Brake
923 796387 Brake
957 591003 Cap-Fuel
Tank
966 795259
Base-Air Cleaner Primer
968 692298 Cover-Air
Cleaner
975 796611 Bowl-Fuel
1009 691127
Screw (Starter Motor)
1036 - - -
Label-Emissions (Available
From any Briggs & Stratton
Authorized
Dealer)
1058 277039TRI Operator’s Manual
1059 692311
Kit-Screw/Washer
(Fuel
Tank)
1095 590507
Gasket Set-Valve
1210 498144
Pulley/Spring Assy., Pulley
1211 498144
Pulley/Spring Assy., Spring
1329 - - -
Replacement Engine
1330 270962
Repair Manual
1386 790848
Vane-Air
1387 790849
Spring-Air Vane
1388 790850
Screw (Air Vane)
- -
398067
Spark Arrester
(available accessory)
Carburetor Overhaul Kit – Key Number 121
Engine Gasket Set – Key Number 358
Valve Gasket Set – Key Number 1095
NOTE:
All component dimensions given in U.S.
inches. 1 inch = 25.4 mm
MODEL NUMBER 128M05-0129-F1
BRIGGS & STRATTON 4-CYCLE ENGINE